From 1ca2348adf88fc693406d28e6c64d8860e164010 Mon Sep 17 00:00:00 2001
From: DBotThePony <dbotthepony@yandex.ru>
Date: Sat, 8 Mar 2025 17:18:45 +0700
Subject: [PATCH] Provide PCG32 wrapper of RandomSource

---
 gradle.properties                             |  2 +-
 .../mc/otm/core/util/LCG64RandomSource.kt     |  5 --
 .../mc/otm/core/util/PCG32RandomSource.kt     | 53 +++++++++++++++++++
 3 files changed, 54 insertions(+), 6 deletions(-)
 create mode 100644 src/main/kotlin/ru/dbotthepony/mc/otm/core/util/PCG32RandomSource.kt

diff --git a/gradle.properties b/gradle.properties
index fa23fe2bf..4b7460417 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -22,7 +22,7 @@ mixin_version=0.8.5
 neogradle.subsystems.parchment.minecraftVersion=1.21.1
 neogradle.subsystems.parchment.mappingsVersion=2024.11.17
 
-kommons_version=3.2.1
+kommons_version=3.3.0
 caffeine_cache_version=3.1.5
 
 jei_version=19.16.4.171
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/LCG64RandomSource.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/LCG64RandomSource.kt
index af4f1bdec..60f07343c 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/LCG64RandomSource.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/LCG64RandomSource.kt
@@ -56,9 +56,4 @@ class LCG64RandomSource(seed: Long = RandomSupport.generateUniqueSeed()) : LCG64
 			throw UnsupportedOperationException()
 		}
 	}
-
-	companion object {
-		const val MULTIPLIER = 6364136223846793005
-		const val INCREMENT = 1442695040888963407
-	}
 }
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/PCG32RandomSource.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/PCG32RandomSource.kt
new file mode 100644
index 000000000..da61dbff2
--- /dev/null
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/PCG32RandomSource.kt
@@ -0,0 +1,53 @@
+package ru.dbotthepony.mc.otm.core.util
+
+import net.minecraft.util.Mth
+import net.minecraft.util.RandomSource
+import net.minecraft.world.level.levelgen.LegacyRandomSource
+import net.minecraft.world.level.levelgen.MarsagliaPolarGaussian
+import net.minecraft.world.level.levelgen.PositionalRandomFactory
+import net.minecraft.world.level.levelgen.RandomSupport
+import ru.dbotthepony.kommons.random.LCG64Random
+import ru.dbotthepony.kommons.random.PCG32Random
+import java.lang.StringBuilder
+
+/**
+ * @see PCG32Random
+ */
+class PCG32RandomSource(seed: Long = RandomSupport.generateUniqueSeed()) : PCG32Random(seed), IRandomSourceGenerator {
+	private val gaussian = MarsagliaPolarGaussian(this)
+
+	override fun setSeed(seed: Long) {
+		this.seed = seed
+		gaussian.reset()
+	}
+
+	override fun nextGaussian(): Double {
+		return gaussian.nextGaussian()
+	}
+
+	override fun fork(): RandomSource {
+		return PCG32RandomSource(nextLong())
+	}
+
+	override fun forkPositional(): PositionalRandomFactory {
+		return Positional(nextLong())
+	}
+
+	class Positional(val seed: Long) : PositionalRandomFactory {
+		override fun at(x: Int, y: Int, z: Int): RandomSource {
+			return PCG32RandomSource(Mth.getSeed(x, y, z).xor(seed))
+		}
+
+		override fun fromHashOf(name: String): RandomSource {
+			return PCG32RandomSource(name.hashCode().toLong().xor(seed))
+		}
+
+		override fun fromSeed(seed: Long): RandomSource {
+			return PCG32RandomSource(seed)
+		}
+
+		override fun parityConfigString(builder: StringBuilder) {
+			throw UnsupportedOperationException()
+		}
+	}
+}